Dyeing process



fiice 2,872,279 Patented! Feb. 3, 1959 DYEING PROCESS George Wiseman,Fairlawn, N. J., assignor to Ciba Company, Inc., New York, N. Y., acorporation of New York No Drawing. Application March 30, 1953 SerialNo. 345,726

1 'Claim. (Cl. 8-55) The present invention relates to a novel dyeingassistant composition which is highly useful in facilitating the dyeingof Dacron (polyester condensation polymer from ethylene glycol andterphthalic acid or methyl terephthalate) and Dynel (copolymer of about60% vinyl chloride and 40% acrylonitrile) textile material.

The novel composition comprises orthophenylphenol, pine oil and turkeyred oil (about 50% sulfonated), preferably in the ratio of about 10 toabout 8 to about 7, respectively.

A feature of the novel composition is that it can be directly added tothe dyebath and disperses therein readily Without separation of itscomponents, in spite of the insolubility of orthophenylphenol and pineoil in water. It readily disperses when diluted with water over a widerange of dilutions and maintains its stability. It

.is particularly useful in dyeing Dacron staple fiber in the form ofloose stock or tops. It is not necessary to pre-dissolve the productwith hot caustic .and to acidify between the pre-treatment and thedyeing as in the case of paraphenylphenol. In addition, the novelcomposition imparts a soft and lofty hand to the textile material.

The following example will serve to illustrate the preparation of thenovel composition;

Example 1 32 parts of pine oil 28 parts of turkey red oil (50%sulfonated) 40 parts of orthophenylphenol are mixed together. A clear,pale, straw-colored liquid is obtained. The parts are by weight.

In applying the novel composition as a dye assistant, the requiredamount of the composition is dispersed in -10 times its own weight ofwater at 80 F. The quantities required will vary with the depth of thedyeing desired. Thus, for light and medium shades on Dacron about 5-10%of the dyeing assistant, based on the weight of the fiber, is employed,while for heavy shades is used.

Thoroughly scoured Dacron is then subjected to the aqueous dispersionfor 2040 minutes at room temperature or 110-120 F. To the bath are addedthe selected dispersed dyestuffs, the temperature gradually raised tothe boil and the dyeing continued for 1 to 1 /2 hours. Suitabledyestuffs are the acetate dyestuffs, which prior to their addition tothe assistant bath are dispersed by any suitable dispersing agent, e.g., by Solvadine G (sodium alkylaryl sulfonate).

After dyeing is complete, the goods are rinsed with warm water, given ascouring in a scouring bath, e. g., one containing about 2% Solvadine Gand l-5% soda ash based on the weight of the goods. The scouringtreatment is carried out at 140-205 F. for 30 minutes. The goods arethen given a final rinse with water, hydroextracted and dried.

The depth and shade of the dyeings produced .are highly improved and inaddition the goods are left with a soft and lofty hand.

The following examples illustrate the dyeing process employing the newdyeing assistant.

Example 2 Dyeings were made on IO-gram spun Dacron skeins at a bathvolume of 30:1 with 15% of the dyeing assistant illustrated in Example1, and 2% of each of the following acetate dyestuffs:

l-hydroxy-4-amino-anthraquinone, 4-amino-4--nitro-azobenzene,3-methyl-6-hydroxy-5 '-acetylamino-azobenzene, 1,4,5,8-tetramino-anthraquinone.

The skeins were pretreated for 20 minutes at F. in 275 ml. of watercontaining the dyeing assistant. The dyestulf, dispersed with 1%Solvadine G, and 25 ml. of hot water, was then added and the temperatureof the bath raised to 212 F. Dyeing was continued at the boil for onehour. Following dyeing, the skeins were rinsed .and then scoured forone-half hour at 205 F. with 5% caustic soda and 2% Solvadine. Allpercentages are based on skein weights.

Example 3 Dyeings are made in the identical manner as described inExample 2 on Dynel skeins except that only 25% of the dyeing assistantcomposition is employed.

The depth and shade of the dyeings produced with the novel dyeingassistant are highly improved and in addition the dyed materials areleft with a soft and lofty hand.

I claim:

A process for dyeing polyethylene terephthalate textile material, whichcomprises pretreating the aforesaid textile material with a compositioncomprising orthophenylphenol, turkey red oil (about 50% sulfonated) andpine oil dispersed in an aqueous medium, adding a dispersed celluloseacetate dye thereto while the textile material is still therein, andsubjecting the pretreated material to the resulting dyebath.

References Cited in the file of this patent UNITED STATES PATENTS2,524,811 Koberlein Oct. 10, 1950 FOREIGN PATENTS 618,829 Great BritainFeb. 28, 1949 OTHER REFERENCES Tech. Bulletin by Du Pont, vol. 7, No. 3,September 1951, pp. 113-115.

Rayon and Syn. Textile for October 1950, pp. 84 and 91.

1. A PROCESS FOR DYEING POLYETHYLENE TEREPHTHALATE TEXTILE MATERIAL,WHICH COMPRISES PRETREATING THE AFORESAID TEXTILE MATERIAL WITH ACOMPOSITION COMPRISING ORTHOPHENYLPHENOL, TURKEY RED OIL (ABOUT 50%SULFONATED) AND PINE OIL DISPERSED IN AN AQUEOUS MEDIUM, ADDING ADISPERSED CELLULOSE ACETATE BYE THERETO WHILE THE TEXTILE MATERIAL ISSTILL THEREIN, AND SUBJECTING THE PRETREATED MATERIAL TO THE RESULTINGDYEBATH.